[PATCH] am_edit: support for vars in _SOURCES

[Aurelien Gateau]

Hello,

As you might know, we are trying to provide stable and unstable versions of
Gwenview (an image viewer from the kdeextragear-1 CVS module). They are
differentiated by a "_hack" suffix, which can be enabled with a ./configure
option. To achieve this, we wrote the following Makefile.am (simplified):

---
gvcore = \
  file1.cpp \
  file2.cpp \
  ...

if GV_HACK_SUFFIX
libgwenview_hack_la_SOURCES = $(gvcore)
...
else
libgwenview_la_SOURCES = $(gvcore)
...
fi
---

The attached patch is necessary for am_edit to properly expand $(gvcore). My
knowledge of Perl and autotools is somewhat limited, but at least it works
for me.
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